Is it possible to check if a variable was defined?

[SLim_Games]

I got the problem that i set the variable $ choice1 = "1" but the player sometimes never reaches this point.and if I check the choice later in the game(if choice1 == "1") I get the "name choice1 is not defined" error. I know that I can set $choice1 = "0" at the beginning of my script. But I rather not, because my game gets updated about every month and the players should be able to use their old save files to continue
here is an example:

Code: Select all

menu:
    "buy the apple":
        $ choice1 = "1"
        "you selected option 1"
        jump option1
    "Steal the apple":
        $ choice1 ="2"
        "you selected option 2"
        jump option2

So is it possible to check if a variable has been defined for example:

Code: Select all

if $ choice1 has no value
    $ choice1 = "0":

something like that.. or is setting the variable at the beginning the only option?

[trooper6]

You need to define your variables. The current best practice is to use default for variables that will change, define for those that won't. So in your case:

Code: Select all

default choice1 = "0"

label start:
    menu:
        "buy the apple":
            $ choice1 = "1"
            "you selected option 1"
            jump option1
        "Steal the apple":
            $ choice1 ="2"
            "you selected option 2"
            jump option2

Note: by using default it will only set the variable as "0" if it had not been previously set. So it should be fine with saves.

Second note: I notice you are defining your variable as a string ("1") rather than as a number (1). Is that really what you want to do?

[SLim_Games]

You need to define your variables. The current best practice is to use default for variables that will change, define for those that won't. So in your case:

Code: Select all

default choice1 = "0"

label start:
    menu:
        "buy the apple":
            $ choice1 = "1"
            "you selected option 1"
            jump option1
        "Steal the apple":
            $ choice1 ="2"
            "you selected option 2"
            jump option2

Note: by using default it will only set the variable as "0" if it had not been previously set. So it should be fine with saves.

Second note: I notice you are defining your variable as a string ("1") rather than as a number (1). Is that really what you want to do?

thanks, this is perfect. This was my first choice I ever made and I made this mistake to save it as a string. but I realised that you can save them as numbers later on. but thanks